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The monarch and Philip are celebrating the milestone privately tonoght

Although their official duties are slowing down, the pair have been keeping active.

The Queen, aged 91, was photographed yesterday riding a horse at Windsor Castle.

Both the Queen and the Prince Philip are well known for their love of horses.

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The couple wed in Westminster Abbey 70 years ago

In the 1970s Prince Philip was a competitive horse and carriage driver, representing Britain at several competitions.

Meanwhile in London, the bells at Westminster Abbey have been ringing out this afternoon to commemorate the wedding, which took place at the church 70 years ago in 1947.

It is a historic tradition that the Abbey bells are rung for significant royal occasions and anniversaries, and the Queen is the first British monarch to celebrate a platinum wedding anniversary. On Saturday, the first in a series of portraits of the couple was released in celebration of the milestone.

The Queen and Philip are preparing to welcome their sixth great-grandchild in April - a third child for the the Duke and Duchess of Cambridge.